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     http://creativecommons.org/publicdomain/zero/1.0/ -->
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<html>
  <head>
    <meta charset="utf-8"/>
    <meta http-equiv="Cache-Control" content="no-cache, no-store, must-revalidate" />
    <meta http-equiv="Pragma" content="no-cache" />
    <meta http-equiv="Expires" content="0" />
    <title>Network Monitor test page</title>
  </head>

  <body>
    <p>Status codes test</p>

    <script type="text/javascript">
      let swRegistration;

      function registerServiceWorker() {
        let sw = navigator.serviceWorker;
        return sw.register("status-codes-service-worker.js")
          .then(registration => {
            swRegistration = registration;
            console.log("Registered, scope is:", registration.scope);
            return sw.ready;
          }).then(() => {
            // wait until the page is controlled
            return new Promise(resolve => {
              if (sw.controller) {
                resolve();
              } else {
                sw.addEventListener('controllerchange', function onControllerChange() {
                  sw.removeEventListener('controllerchange', onControllerChange);
                  resolve();
                });
              }
            });
          }).catch(err => {
            console.error("Registration failed");
          });
      }

      function unregisterServiceWorker() {
        return swRegistration.unregister();
      }

      function performRequests() {
        return new Promise(function doXHR(done) {
          let xhr = new XMLHttpRequest();
          xhr.open("GET", "test/200", true);
          xhr.onreadystatechange = done;
          xhr.send(null);
        });
      }
    </script>
  </body>

</html>
